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Heat oven to 190C/170C fan/gas 5. Halve the 2 part-baked baguettes lengthways and cook directly on the oven shelf for 8 mins. Meanwhile mix the diced peppers, sweetcorn, tuna, and 75g of the grated cheddar.
Transfer the baguettes to a baking tray, spread each with 1 tbsp tomato purée, divide the tuna mix over, then sprinkle with the remaining grated cheddar. Bake for 12 mins until melting and golden.